Mean and residual stress effects on fatigue behavior in a pre-strained corner of stainless steel sheet

Oh, Gyoko; Akiniwa, Yoshiaki

doi:10.1016/j.ijfatigue.2020.106125

Cited by 10 publications

(8 citation statements)

References 31 publications

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“…Recently, Oh and Akiniwa 21 successfully correlated positive mean stress effect on fatigue life of a pre‐strain stainless‐steel corner sheet using an apparent fully reversed stress amplitude

σ_{ar}^{*}

calculated by the following SWT function:

σ_{ar}^{*} = \sqrt{E ε_{a} σ_{\max}} for σ_{m} \geq 0 .

…”

Section: Discussionmentioning

confidence: 99%

An interpretation and modification of the SWT function

Kujawski

2021

Fatigue Fract Eng Mat Struct

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In this paper, a new interpretation and modification of the SWT function in terms of the total damaging energy density are proposed and discussed. The total damaging energy density is the sum of the damaging part of the strain energy density and complementary energy density corresponding to the first quadrant in damaging σD‐εD axes. For cyclic loading with a positive mean stress (σm ≥ 0), the proposed function reduces to the original SWT formulation. For cyclic loading with a negative mean stress (σm < 0), the maximum stress is augmented by 1/3 of absolute value of the mean stress. The proposed approach shows a consistent correlation of the mean stress effects for both positive and negative mean stresses.

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σ_{ar}^{*}

calculated by the following SWT function:

σ_{ar}^{*} = \sqrt{E ε_{a} σ_{\max}} for σ_{m} \geq 0 .

…”

Section: Discussionmentioning

confidence: 99%

An interpretation and modification of the SWT function

Kujawski

2021

Fatigue Fract Eng Mat Struct

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“… The measured loading amplitudes M a and cycles to failure N f by the fatigue tests were plotted in the M – N relationship. All plots between 9 × 10 4 and 2 × 10 6 cycles in the HCF regime were regressed as a baseline by means of the least squares method. The strength coefficient C M and strength exponent m were obtained based on the power equation of

M_{i} = C_{M} {N_{f}}^{- \frac{1}{m}}

22–26 . At the same time, the constants of A and B were obtained based on the linear‐logarithmic equation of M i = A + B log N f 7,15 .…”

Section: Methodsmentioning

confidence: 99%

“…The mechanical properties of the cone material were as follows: tensile strength 441 MPa, 0.2% proof stress 279 MPa, and elongation 36.8%. The fatigue strength of the cone material sheet at 5 × 10 5 cycles, denoted as S a (sheet) , was 335 MPa through plane bending fatigue tests 10,22 . These two portions were jointed through an automatic metal inert gas lap welding, using a welding wire of 1.2‐mm diameter of 24%Cr–14%Ni austenitic steel (similar to AISI 309 or JIS SUS309L).…”

Section: Methodsmentioning

confidence: 99%

“…The fatigue strength of the cone material sheet at 5 Â 10 5 cycles, denoted as S a(sheet) , was 335 MPa through plane bending fatigue tests. 10,22 These two portions were jointed through an automatic metal inert gas lap welding, using a welding wire of 1.2-mm diameter of 24%Cr-14%Ni austenitic steel (similar to AISI 309 or JIS SUS309L). The welded specimens were supplied to the tests without heat treatment.…”

Section: Specimens and Fatigue Testsmentioning

confidence: 99%

“…All plots between 9 Â 10 4 and 2 Â 10 6 cycles in the HCF regime were regressed as a baseline by means of the least squares method. The strength coefficient C M and strength exponent m were obtained based on the power equation of [22][23][24][25][26] At the same time, the constants of A and B were obtained based on the linearlogarithmic equation of M i = A+BlogN f . 7,15 The corresponding coefficients of determination, R 2 , were obtained.…”

Section: Statistical Analysis Processmentioning

confidence: 99%

See 2 more Smart Citations

Fatigue fracture and probabilistic assessments of a cone and pipe welded structure of stainless steels

Oh¹

2021

Fatigue Fract Eng Mat Struct

Self Cite

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Probabilistic assessments are important for weldments due to large scatters in the fatigue strength. Using thin‐walled cone‐pipe welded joints of stainless steels, fatigue tests under bending loads were carried out. The test data were statistically analyzed with the Benard's approximation, Gaussian, 2P‐Weibull, and 3P‐Weibull distributions. Stress–life curves at different failure probabilities by a uniform scatter band model were obtained. The metallographic structures were investigated, and the stress concentration states were analyzed to elucidate the causes of the strengths and scatters. In the high‐cycle fatigue regime, the 3P‐Weibull distribution was most matched with the Benard's approximation, and the coefficient of determination was 0.9817. The microstructure of the weld metal with a high weld opening angle was mainly ferrite phase with 20% austenite distribution, which had the high strength. The stress concentration factors depended on the weld opening angle, indicating the main factor that affected strengths and scatters.

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Forced response with shaker test and analytical approach using mode equivalent factors on a coupled catalyst muffler system

Oh¹

2021

Applied Acoustics

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Mean and residual stress effects on fatigue behavior in a pre-strained corner of stainless steel sheet

Cited by 10 publications

References 31 publications

An interpretation and modification of the SWT function

An interpretation and modification of the SWT function

Fatigue fracture and probabilistic assessments of a cone and pipe welded structure of stainless steels

Forced response with shaker test and analytical approach using mode equivalent factors on a coupled catalyst muffler system

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